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Acid-Base Equilibrium
Atomic Structure And Related Patterns In The Periodic Table
Bonding And Structure, And Intermolecular Forces
Chemical Equilibrium
D-Block Elements (Transition Elements)
DESCRIPTIVE INORGANIC CHEMISTRY: Group IV (14)
DESCRIPTIVE INORGANIC CHEMISTRY: Halogens (GROUP VII or 17)
DESCRIPTIVE INORGANIC CHEMISTRY: Modern Periodic Table, Periodicity And S-Block Elements
Functional Group Chemistry And Reaction Mechanism
ORGANIC CHEMISTRY: Fundamentals
Raoult’s Law And Phase Equilibria
Reaction Kinetics
Redox Equilibrium
The Mole Concept

What happens to the mass number and the atomic number of an element when it undergoes beta decay?

The mass number does not change and the atomic number increases by 1.

Neither the mass number nor the atomic number change.

The mass number does not change and the atomic number decreases by 2.

The mass number decreases by 4 and the atomic number decreases by 2.

Because a few alpha particles bounced back from the thin gold foil, Rutherford concluded that they were:

Neutrons

striking electrons.

repelled by densely packed regions of positive charge.

magnetic.

An element X (X is not the usual symbol) occurs in two isotopes ₃₅⁷⁹X and ₃₅⁸¹X in the ratio 3:2 respectively, what is the R.A.M of X?

79.8

What happens to the mass number and the atomic number of an element when it emits alpha radiation?

The mass number increases by four and the atomic number increases by two.

The mass number remains unchanged while the atomic number increases by one.

The mass number remains unchanged while the atomic number decreases by one.

The mass number decreases by four and the atomic number decreases by two.

Given below are the successive ionization energies, in KJmol⁻¹ of Calcium, magnesium, rubidium and strontium (not in order).

Which is the series for calcium?

590, 1100, 4900, 6500

550, 1050, 4200, 5500

400, 2700, 3800, 5100

740, 1500, 7700, 10500